Thermic Actuator
Siemens
Product Guard
Warranty
24 Vac/Vdc, Two-Position control
Spring Return
Zone Valves
Thermic Electronic Valve Actuator.
Description
Thermic Actuators require a 24 Vac/Vdc control signal to
provide two-position, NO or NC control. This actuator is
designed to work with Zone Valves with a 1/10-inch
(2.5 mm) stroke.
Features
• Direct-coupled — install without tools
• Movement and position indication
• Robust, no maintenance required
• Friction-free
• Two-wire connection
• Standard versions with 3.9 foot connecting cable
• PWM control
• AC/DC two-position control
Applications
Thermic Actuators are for use with 1/10-inch (2.5 mm)
stroke Zone Valves.
A-119
Valves
Siemens
Product Guard
PLUS 3 Warranty
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Thermic Actuator Specifications
A-120
Power Supply
Supply Voltage ........................................24 Vac, 50 to 60 Hz or 24 Vdc
Power Consumption ................ Normal Operation 2.5W; Power on 6 VA
Switch-on Current (Transient) .................................................... 250 mA
Stroke ...................................................................Max. 0.18 in. (4.5 mm)
Nominal Force ...................................................................22.5 lb. (100N)
Positioning Time
at 65ºF (20ºC) ............................................................................270 sec
Permissible Temperature of Medium in Valve ........34-230ºF (1-110ºC)
Thermic Actuators
Product Ordering
Actuator
Prex
Description Part No.
24 Vac/Vdc, Normally Closed STA73U 346
24 Vac/Vdc, Normally Open STP73U 347
Code
Operation
Temperature ...................................................... 41 to 122°F (5 to 50°C)
Humidity ..................................................................................<85% RH
Storage
Temperature ...................................................... 41 to 122°F (5 to 50°C)
Humidity ...........................................................................5 to 100% RH
Transport
Temperature .................................................... -4 to 140°F (-20 to 60°C)
Humidity ..................................................................................<95% RH
Agency Approvals ....................................Conforms to CE Requirements
Dimensions (H x W x D) .................. 2.9 x 2.6 x 1.7 in. (74 x 65 x 44 mm)
Shipping Weight ...............................................................0.4 lb. (0.18 kg)
Valves
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Dimensions
H
H
1
W
1
W
C
H
H
1
C
W
1
W
2.91 (74)
EA1439R1
2.91 (74)
Thermic Actuator:
2-Way Valve Assembly Service Envelope
STA73U STP73U
Thermic Actuator:
3-Way Valve Assembly Service Envelope
A-121
Valves
2.72 (69)
1.69 (43)
2.56 (65)
1.73 (44) 2.72 (69)
EA1440R1
1.69 (43)
2.56 (65)
1.73 (44)
Dimensions shown in inches (mm).
Valve Center Line to
Valve Size
in. (mm)
0.5 (15) 3.90 (99) 3.90 (99) 8.20 (200) 8.20 (200) 1.00 (25) 1.00 (25) 1.75 (44) 1.75 (44) 9.86 (251) 9.86 (251)
0.5 (15) 3.90 (99) 3.90 (99) 8.20 (200) 8.20 (200) 1.00 (25) 1.00 (25) 1.75 (44) 1.75 (44) 9.86 (251) 9.86 (251)
0.75 (20) 3.90 (99) 3.90 (99) 8.20 (200) 8.20 (200) 1.00 (25) 1.00 (25) 1.75 (44) 1.75 (44) 9.86 (251) 9.86 (251)
1.00 (25) 3.90 (99) 3.90 (99) 8.20 (200) 8.20 (200) 1.00 (25) 1.00 (25) 1.75 (44) 1.75 (44) 9.86 (251) 9.86 (251)
Table expressed in inches (mm)
Top of Actuator
1
H
Service Height
H
2-Way 3-Way 2-Way 3-Way 2-Way 3-Way 2-Way 3-Way 2-Way 3-Way
Valve Center Line to
Actuator Coupling
C
Width or Diameter
of Actuator
1
W
Service Width
W
Service height and width are the recommended dimensions to allow access to the product.
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